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Recent content by coolFL

  1. coolFL

    Strange output from UMAT/Material properties not assigned to all the elements in the domain

    Hello Everyone, I did very simple axisymmetric contact model of ball and plate. For plate material I have used UMAT to define user defined material properties. My problem is, when I extract stress/strain from UMAT for specific element number to .msg file. I don't see anything. I see output for...
  2. coolFL

    How to propagate predefined stress field in Abaqus across multiple steps?

    Hello Everyone, I am doing one Abaqus simulation in which I have used user subroutine to define initial stress condition in the geometry. However, I see that this stress condition gets modified and is not propagated as it is across subsequent Abaqus steps. Can anyone suggest me any possible...
  3. coolFL

    3D Cyclic loading on unit volume element

    Hey, Since the solution is not converging, I guess forces are not in balance at elemental/nodal level. But at global level I have applied equal and opposite forces in all directions, therefore I thought my solution should converge. Ideally there are no boundary conditions to this volume element...
  4. coolFL

    3D Cyclic loading on unit volume element

    Hey, Thanks for your reply! Yes all the loads are self balancing during entire analysis. In the model, I have applied loads as stresses/pressure. Same pressure is applied on the opposite faces. meaning S11 of same magnitude is applied on the faces perpendicular to X axis. Similarly, S22 is...
  5. coolFL

    3D Cyclic loading on unit volume element

    Hello Everyone, I am doing one very simple 3D simulation in abaqus. It includes unit volume element which is loaded with three normal stress components along three coordinate axes and one shear stress component (in XY plane). The stress amplitudes vary periodically as function of time over the...
  6. coolFL

    Issues with Python script for *SIGINI subroutine

    Yes it does.
  7. coolFL

    Issues with Python script for *SIGINI subroutine

    Hello everybody,  I am doing one residual  stress simulation. I have two part instances which come in contact and one of them has non-uniform residual stresses from the beginning. I have written *SIGINI subroutine to apply non-uniform initial stress. I tried to apply this stress using python...
  8. coolFL

    Possible bug: significant difference in integration point stresses and stress at element's centroid

    Hello all,  I did one elastic-plastic simulation using Abaqus/FEA. I used C3D20T (hexahedral quad) solid element which has 27 integration points and 20 nodes. For one of the element, the stress that I got at the centroid is completely different from the stresses that I got at the integration...
  9. coolFL

    Possible bugs in Abaqus/CAE 6.13-2 in coordinate transformation

    Hi Everybody, My question is regarding transformation of results from rectangular coordinate system to cylindrical coordinate system. I created quarter symmetric cylinder model and I wanted to see results in cylindrical coordinate system. When I see output for COORDS->COOR1 (which is the...
  10. coolFL

    How to control IVOL per integration point inside each element?

    Hi IceBreakerScours, Thanks for your message! Yes 5% variation in IVOL is matter of concern for me because I plan to assign different material properties at each integration point within element. Therefore, I need to have some control over the percent volume fractions of the different...
  11. coolFL

    How to control IVOL per integration point inside each element?

    Hey, I did one 3D simulation with 126750 elements of type of C3D8T. This has 8 integration points per element. I extracted IVOL values of each integration point for all the elements to determine percent volume fraction allocated to each integration point within an element. The minimum and...
  12. coolFL

    How to control IVOL per integration point inside each element?

    Hello all, I want to do one simulation in which I want to control the assigned integration point volume inside each of the element. One preliminary analysis shows that this assignment is random inside C3D20T elements with 27 integration points. Hence can somebody direct me on how to control...
  13. coolFL

    Simulation using C3D20T elements is very expensive compared to simulation with C3D20 -for same model

    Hello everybody, I am doing one 3D contact simulation between two bodies. I did my simulation using static general steps with C3D20 elements (i.e. Hex 2nd order). It finished in 28 hours with 1E+14 floating point operations. Then I performed the same simulation using coupled temperature...
  14. coolFL

    For UMAT analysis, how to convert local CSYS into global CSYS?

    Hi everybody, I am doing one analysis with UMAT, in which I want to assign material properties to the points in space based on their co-ordinates in user defined local CSYS. The problem is UMAT by default uses coordinates of the points based on global CSYS. Hence can somebody please guide me...
  15. coolFL

    Compilation error in simple UMAT subroutine

    Hi everybody, I am trying to simulate UMAT subroutine for very simple 3D problem. I have a cantilever beam and I am applying (-ve) pressure at one end. In UMAT, I have written a code for Isotropic Isothermal elasticity. Which is nothing but *ELASTIC option in Abaqus. But still I am getting...
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